I have (still) a Kramer The Duke. (I've tried to sell it twice now... both times screwed up, not either buyer's fault.) I suppose I'll post it again at some stage. It sounds more like an octave-down electric than a "conventional" bass - I don't know how much of that is the pickup, I suppose the aluminium neck must have some effect. I did find it hard to keep in tune, but the design is not great and that may well be part of the problem.